The 225-mile Katy Trail State Park is one of the crown jewels of North America’s rail-trail system. It follows a former route of the Missouri-Kansas-Texas Railroad -- the MK&T, or Katy for short -- between St. Charles and Sedalia, Missouri. A quiet artery, the Katy Trail transports cyclists and other self-propelled travelers through the heart of Missouri. On a grander scale, the riverside portions of the trail between St. Charles and Boonville serve as components of a pair of trails that are national in scope: the Lewis and Clark National Historic Trail and the coast-to-coast American Discovery Trail.